<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!-- 
    文字水平对齐 align="left right center"
    文字垂直对齐 valign="top middle bottom" 
    -->
    <table border="1" width="300px" height="300px" bgcolor="yellow">
        <tr bgcolor="orange" width="100px" height="200px" 
        align="center" valign="top">
            <td>1</td>
            <td>2</td>
        </tr>
        <tr>
            <td>3</td>
            <td>4</td>
        </tr>
    </table>
</body>
</html>